Product Overview
The Siemens Flender H2DH09 is a high-performance, two-stage helical gear unit engineered for heavy-duty industrial drives requiring a hollow shaft connection. This 55kW-rated model utilizes a shrink disk mounting system, providing a high-integrity, keyless mechanical interference fit. The H2DH09 is specifically designed to eliminate the maintenance issues associated with keyed shafts, offering superior torque transmission and simplified installation for large-scale machinery.
As a core component of the Flender industrial series, the H2DH09 is built for reliability and high power density. The "D" designation signifies the hollow shaft output, which allows the gearbox to be mounted directly onto the driven machine's shaft, saving significant space and eliminating the need for flexible couplings. The integration of a 55kW input capacity makes it an ideal choice for medium-to-heavy industrial applications where uptime is critical. Every H2DH09 unit undergoes rigorous testing to ensure it meets international standards for load-bearing capacity and thermal efficiency.
Technical Parameter Table
| Parameter | Specification |
| Input Power | 55 kW |
| Nominal Output Torque | 23,000 Nm |
| Hollow Shaft Bore | 125 mm (Standard for Size 09) |
| Gear Stages | 2-Stage Helical |
| Shrink Disk Position | Opposite side of the input (Standard) |
| Housing Construction | Rigid Grey Cast Iron |
| Standard Efficiency | > 96% per stage |
| Approximate Weight | 610 kg |
Product Features: H2DH09 Specific Highlights
Zero-Backlash Shrink Disk Connection: The H2DH09 utilizes a heavy-duty external shrink disk that creates a friction-locked connection. This eliminates the risk of fretting corrosion common in keyed shafts, especially in reversing drive applications.
Optimized Gearing Geometry: The helical gears are calculated using advanced FEM (Finite Element Method) analysis, ensuring that the 55kW load is distributed across the tooth flanks to minimize local stress concentrations.
Enhanced Dust Protection: For size 09 units, the sealing system is upgraded to handle the larger shaft circumference, utilizing specialized oil seals that maintain a tight interface even under high thermal expansion.
Component Structure & Mounting Versatility
The H2DH09 is engineered with a Universal Housing concept. A key structural advantage is the integrated torque arm mounting point. Because the hollow shaft design allows the gearbox to "float" on the driven shaft, the unit requires a torque arm to resist the reactionary force of the drive. The H2DH09 housing includes reinforced bolting zones that allow the torque arm to be mounted on either the top or bottom, providing engineers with maximum flexibility in cramped installation environments.
Related Model Reference Table
| Model Variant | Output Configuration | Shaft Interface | Primary Use Case |
| H2SH09 | Solid Shaft | Parallel Key | Traditional Coupling Drive |
| H2DH08 | Hollow Shaft | Shrink Disk | Lower Torque / Compact Space |
| H2DH10 | Hollow Shaft | Shrink Disk | High Load Material Handling |
| B2DH09 | Hollow Shaft | Right-Angle Bevel | Perpendicular Motor Layout |
Industry Applications
Mining & Minerals: Large-scale belt conveyors and bucket elevators.
Pulp & Paper: Driving rollers in pressing and drying sections.
Chemical Industry: Heavy-duty mixers and horizontal agitators.
Waste Management: Primary drives for industrial shredders and compactors.
FAQ
1. What are the advantages of a shrink disk over a keyed hollow shaft for the H2DH09?
The shrink disk provides a 360-degree friction fit, which eliminates "play" in the connection. This is vital for 55kW loads that involve frequent starts, stops, or reversals, as it prevents the shaft from wearing down or shearing a key.
2. Can the H2DH09 be mounted vertically?
While the H2DH09 is primarily a horizontal unit, vertical variants (with specific lubrication modifications) are available. Please specify the orientation at the time of ordering to ensure the upper bearings receive proper lubrication.
3. What maintenance does the shrink disk require?
Shrink disks are largely maintenance-free once properly torqued. However, during routine inspections, it is recommended to verify the bolt tension and ensure no moisture has caused corrosion between the disk and the shaft.
4. Is forced lubrication necessary for a 55kW input?
For most standard speeds, splash lubrication is sufficient. However, if the H2DH09 is used in high-speed applications or extreme ambient temperatures, an external oil cooling system or forced lubrication pump may be required.
5. How do I select the correct torque arm for this model?
The torque arm must be sized based on the maximum output torque (23,000 Nm). We provide standard steel torque arms designed specifically for the H2DH09 housing geometry to simplify the installation process.
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